Hi,
I'm getting: Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 36681889 bytes) in /home/mysite/public_html/system/storage/modification/admin/controller/extension/modification.php on line 809. It hasn't caused any malfunctioning as far as i can tell though.

I went to line 809 and this is what I found
808 if (file_exists($file)) {
809 $data['log'] = htmlentities(file_get_contents($file, FILE_USE_INCLUDE_PATH, null));
810} else {
811 $data['log'] = '';
812 }

You should first increase the memory limit in your OC php.ini files to i.E.:memory_limit = 640M; (my OC Memory settings)
and set the PHP Server Memory also in the Site Admin Section,
by use of the myPHP-Admin Tool, and as shown on the image below.
And second find out, what's using so much space in the Modification Section...
Good Luck!
Ernie
---

Well, if you have no such Server settings, available to be changed by you,
you have to get in contact with the hoster, to find out, how much server memory
you are allowed to use.
And you could check your Shop / System / Modification Section, to find out,
what it contains on files. And if you cannot find out, you'll need Dev-Support on this.
Good Luck !
Ernie